Design And Power Management Of Power Supply System For Vertical Aeroponic Cultivation In Controlled Micro-environment

This thesis is supported by "The research and application of key technologies of water and fertilizer integrated vertical aeroponic cultivation intelligent monitoring system"(201803D221028-2)in the agricultural project of Shanxi Province's key research and development plan.Fresh vegetables are important nutrients in the logistics of polar scientific investigations.It is such an important necessity that supply has become a problem.First of all,it is impossible to grow in the Antarctic region.Secondly,the nutrients in vegetables are largely lost in the refrigerated transport,and corrupted vegetables can also produce harmful substances.To this end,vertical aeroponic cultivation technology in controlled micro-environment applied to the polar regions has been studied.This technology requires no soil,and the entire planting equipment can be used for efficient planting.However,the planting system supported by this technology requires a series of monitoring facilities.Considering the current power supply situation of the Antarctic scientific research stations,the continued use of diesel power generation for the whole planting facility has many disadvantages,which will not only increase the burden of the power supply system,but also increase environmental pollution.In severe cases,it will affect the use of key scientific research equipments and the use of electricity by team members.From the perspective of the geographical environment and climate characteristics of the Antarctic Zhongshan station,this thesis develops a wind-solar hybrid power supply system and its power management research for vertical aeroponic cultivation facility in controlled micro-environment.This thesis systematically expounded the overall scheme of the wind and solar hybrid power supply system of vertical aeroponic cultivation facility in controlled micro-environment.The distribution of wind and light intensity resources in the station area had been obtained based on the analysis of the climatic conditions of Zhongshan station.The electrical characteristics of the power supply object were analysed and the electrical design of the power supply system was given.The capacity of wind turbine,photovoltaic system and energy storage battery were scientifically configured and the selections of key equipments were completed.Based on the principle of improving energy acquisition efficiency,the power generation side control algorithm of the power supply system was studied by Matlab simulation software.The power output characteristics of vertical axis wind turbine and photovoltaic system output characteristics were analyzed.The MPPT algorithm of the them was selected.The control algorithms of the energy storage side and the load side of the power supply system were studied.The charging characteristics and charging and discharging methods of lead-acid batteries were analyzed.The charging and discharging circuit and charging and discharging control algorithm of the energy storage side were selected,and the energy storage side discharge and three-stage charging control were realized by Matlab software.The working principle and control algorithm of the load side inverter were expounded and the simulation realized the stable power supply under the load power fluctuation.On this basis,in order to better coordinate the power balance between the power generation side,the energy storage side and the power side,to ensure reliable operation of the power supply system in extreme extreme environments and to provide stable power supply for the vertical aeroponic cultivation facility in controlled micro-environment,power management strategy of power supply system was studied in this thesis.The various influencing factors that the power supply system may faced were analyzed in detail,and relevant indicators were proposed for the formulation of the power management strategy.The different operating states of the power supply system in the extreme night and non-polar night were studied,and the various situations were analyzed and the control decisions that should be taken in each part under various conditions were analyzed.The power balance management strategy based on power balance is proposed and the details of the strategy are described in detail.Based on theoretical analysis and simulation experiments,the hardware and software of the controller of the wind and solar hybrid power supply system of the vertical aeroponic cultivation facility in controlled micro-environment were designed.With STC8A8K64S4A12 as the main control chip,the main power circuit of the power supply system,control core circuit,signal acquisition circuit,isolated drive circuit and auxiliary power supply circuit were designed.The software part includes system initialization program,main program and interrupt program.The interrupt program includes ADC acquisition control program,wind turbine and photovoltaic control program,battery charge and discharge control program,unloading control program,and serial-PC communication program.The software and hardware debugging and experiments of the system were completed.